IPAD 9TH GENERATION CHARGER

if your charging cable has a usb-c connector then it's this one Buy 20W USB-C Power Adapter - Apple

if your charging cable has an usb-a connector then this one Apple 12W USB Power Adapter - Apple

as long as the connector of any cable match the ipad then you use any cable with any connector in the other end as long as it match the ac charger you wish to use with it

Recent models of iPad are supplied with a 20W USB-C Power Adapter.

If your existing charging cable has a USB-C connector on one end - and a Lightning connector on the other - then you'll likely wish to replace the lost item with a matching 20W USB-C Power Adapter.

If instead your charging cable has the larger (rectangular) USB Type-A connector, the iPad will have been supplied with a 12W Power Adapter. In this situation, you can replace the lost Power Adapter with (a) a similar model Power Adapter - or (b) replace with a 20W USB-C Power Adapter and a USB-C to Lighting charging cable.

As Power Adapters differ by country (to accommodate the different AC power outlet), you'll need to select the Power Adapter for your country from Apple's website. This web-page should default to the correct page for your country/region:

Charging Essentials - iPad Accessories - Apple